Every time it rains, Washington, D.C. -- like most major cities -- is plagued by stormwater runoff, which has gravely contaminated the city's three major rivers (the Potomac, the Anacostia, and Rock Creek). To clean up the pollution, the city's Water and Sewer Authority (WASA) -- known as DC Water since 2010 – originally planned to rely on conventional stormwater management practices, which are costly and outdated. In this July 2002 report, NRDC recommended instead that WASA adopt an approach called low-impact development, which would use "green" roofs, strategically placed beds of native plants, rain barrels, and other measures to soak up rain and prevent it from washing directly into waterways. NRDC also urged the local government and WASA to restructure the city's flat stormwater fee, protect environmentally sensitive lands, restore the urban forest, and encourage water conservation and water reuse techniques.